different between coincidence vs sametime

English

From French coïncidence.

Morphologically coincide +? -ence.

coincidence (countable and uncountable, plural coincidences)

Of objects, the property of being coincident; occurring at the same time or place.
Of events, the appearance of a meaningful connection when there is none.
(mathematical analysis) A coincidence point.
(geometry) A fixed point of a correspondence; a point of a variety corresponding to itself under a correspondence.

(of objects and time): concurrentness, synchronicity; see also Thesaurus:simultaneousness
(in analysis): coincidence point

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